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The BMJ should have declared competing interests in relation to this editorial by Fiona Godlee and colleagues (BMJ 2011;342:c7452, doi:10.1136/bmj.c7452). The BMJ Group receives advertising and sponsorship revenue from vaccine manufacturers, and specifically from Merck and GSK, which both manufacture MMR vaccines. For further information see the rapid response from Godlee (www.bmj.com/content/342/bmj.d1335.full/reply#bmj_el_251470). The same omission also affected two related Editor’s Choice articles (BMJ 2011;342:d22 and BMJ 2011;342:d378).